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ORG 0000H;
JMP MAIN;
ORG 0003H;
JMP INP0;
ORG 0030H;
/*鍵盤所輸入數(shù)字依次存入70H-77H*/
MAIN: MOV R6, #70H;
MOV SP, #60H;
CLR 80H;
CLR 81H;
SETB EA;
SETB EX0;
SETB IT0;
DISP1: MOV R0, #70H;//從第一位地址存數(shù)
MOV R2, #01H;//位選第一位
DISP2: MOV A, @R0;
LCALL SEG7; //跳轉(zhuǎn)段碼
MOV P0, A; //P0輸出字形
MOV P2, R2; //位選輸出
LCALL D1MS; //跳轉(zhuǎn)延時(shí)
MOV P2, #0; //位選關(guān)閉，段碼不輸出
INC R0; //選擇下一位；
MOV A, R2;
CLR C; //進(jìn)位標(biāo)志清零
RLC A; //掃描字右移
MOV R2, A; //保存掃描字
JNC DISP2; //C=0時(shí)，循環(huán)一次未結(jié)束，跳轉(zhuǎn)到DISP2
PASS: LJMP DISP1;
D1MS: MOV R7, #50H;//延時(shí)程序
DMS: DJNZ R7, DMS;
RET;
SEG7: MOV DPTR, #TABLE;//查表程序
MOVC A, @A+DPTR;
RET;
TABLE: DB 0C0H, 0F9H, 0A4H, 0B0H;
DB 99H, 92H, 82H, 0F8H;
DB 80H, 90H, 88H, 83H;
DB 0C6H, 0A1H, 86H, 8EH;
/*P1.0-1.3，行線； P1.4-1.7，列線；*/
/*P0，輸出字形； P2，輸出位選*/
INP0:
PUSH ACC;
PUSH B;
PUSH PSW;
START: MOV R4, #00H;
L1: MOV R3, #0F7H;//設(shè)掃描初值，11110111，P3.3=0
MOV R1, #00H; //取碼指針；
/*首先行掃描*/
L2: MOV A, R3; //行掃描開始
MOV P1, A; //掃描值輸出至p1
MOV A, P1; //讀入P1的值
MOV R4, A; //P3口中P3.4-3.7的狀態(tài)通過A，傳送到R4
SETB C; //進(jìn)位標(biāo)志置1
MOV R5, #04H; //
l3: RLC A; //按鍵左移，通過C是否為0，判斷此列是否有0；無(wú)0則r1進(jìn)行累加；有0跳轉(zhuǎn)到延時(shí)，
JNC KEY; //C=0，跳轉(zhuǎn)到延時(shí)
INC R1;
DJNZ R5, L3;
MOV A, R3;
SETB C;
RRC A; //換行掃描
MOV R3,A;
JC L2; //C=1，跳轉(zhuǎn)到L2
KEY: ACALL DELAY;
D1: MOV A,P1;
XRL A,R4;
JNZ D1;
MOV A, R6; //指定存入地址
MOV R0, A;
MOV A, R1; //存入數(shù)字
MOV @R0, A;
/*判斷運(yùn)算法*/
MOV A, R1;
XRL A, #0AH;//判斷是否為加法符
JZ ADD1;
MOV A, R1;
XRL A, #0BH;//判斷是否為減法符
JZ SUBB1;
MOV A, R1;
XRL A, #0CH;//判斷是否為乘法符
JZ MUL1;
MOV A, R1;
XRL A, #0DH;//判斷是否為除法符
JZ DIV1;
MOV A, R1;
XRL A, #0EH;//判斷是否為等于號(hào)
JZ EQUAL1;
MOV A, R1;
XRL A, #0FH;//判斷是否為清零鍵
JZ ON1;
INC R0; //選擇下一個(gè)地址
MOV A, R0; //存入r0的新數(shù)值
MOV R6, A;
POP PSW;
POP B;
pop ACC;
RET;
DELAY: MOV R7, #60;//消除抖動(dòng)延時(shí)程序
DLY1: DJNZ R7, DLY1;
RET;
ADD1: MOV A, 80H; //加法程序
MOV 81H, A;
LJMP D1;
MOV A, 81H;
ADD A, 80H;
MOV 80H, A;
RET;
SUBB1: MOV A, 80H;//減法程序
MOV 81H, A;
LJMP DD1;
MOV A, 80H;
SUBB A, 81H;
MOV 80H, A;
RET;
MUL1: MOV A, 80H;//乘法程序
MOV 81H, A;
LJMP DD1;
MOV A, 80H;
MUL AB;
MOV 80H, A;
RET;
DIV1: MOV A, 80H;//除法程序
MOV 81H, A;
LJMP DD1;
MOV A, 80H;
DIV AB;
MOV 80H, A;
RET;
EQUAL1: MOV A, 80H;//等于程序
MOV B, #64H;//算百位數(shù)
DIV AB;
MOV 72H, A; //將此數(shù)除100，商數(shù)放72h，余數(shù)放71h。
MOV 71H, B;
MOV A, 71H;
MOV B, 0AH;//算十位數(shù)
DIV AB;
MOV 71H, A; //將此數(shù)除10，商數(shù)放71h，余數(shù)放70h。
MOV 70H, B;
RET;
ON1: CLR 70H; //清零程序
CLR 71H;
CLR 72H;
CLR 73H;
CLR 78H;
CLR 79H;
CLR 7AH;
CLR 80H;
CLR 81H;
CLR 82H;
CLR 88H;
CLR 89H;
CLR 8AH;
MOV R0, 00H;
MOV R1, 00H;
MOV R2, 00H;
MOV R3, 00H;
MOV R4, 00H;
MOV R5, 00H;
MOV R6, 70H;
MOV R7, 00H;
RET;
DD1: MOV B, #0AH;//將所輸入兩位數(shù)轉(zhuǎn)換為十進(jìn)制，并存入80h中
MOV A, 78H;
MUL AB;
ADD A, 70H;
MOV 80H, A;
RET;
END;

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